How does the Fitbit Versa 4's SpO2 feature compare to other smartwatches

Accuracy and Functionality

- Fitbit Versa 4: The Versa 4 tracks SpO2 levels overnight, providing users with insights into their blood oxygen saturation during sleep. While it offers useful data, Fitbit's SpO2 readings are not intended for medical purposes and may not be as precise as those from dedicated medical devices[4][7]. Users have reported averages ranging from 93% to 98%, but the accuracy can vary[7].

- Garmin Venu 3: This smartwatch is praised for its accurate SpO2 readings and offers continuous monitoring, making it a strong competitor in terms of both accuracy and functionality. It provides all-day SpO2 tracking, taking readings every five minutes, which is beneficial for users who need frequent monitoring[2].

- Fitbit Sense 2: Similar to the Versa 4, the Sense 2 tracks SpO2 levels overnight but does not support spot checks. It automatically sends data to the Fitbit app, which can be useful for monitoring sleep apnea. However, it requires a subscription to Fitbit Premium for full access to features[2][5].

- Withings ScanWatch: This smartwatch has received FDA approval for its SpO2 tracking, making it one of the most reliable options for accurate blood oxygen monitoring. It is designed for continuous health monitoring and is particularly effective for sleep tracking and detecting conditions like sleep apnea[2].

Comparison Points

- Continuous Monitoring: The Garmin Venu 3 and TicWatch Pro 5 offer continuous SpO2 monitoring, which is more comprehensive than the overnight tracking provided by Fitbit models like the Versa 4 and Sense 2[2][8].

- Accuracy and Reliability: The Withings ScanWatch stands out for its FDA approval and clinical validation, making it a top choice for those seeking precise SpO2 readings. The Garmin Venu 3 is also noted for its accurate readings[2].

- Additional Features: The Fitbit Sense 2 offers a broader range of health features, including ECG and stress monitoring, which may appeal to users looking for a more comprehensive health tracking experience[6].

In summary, while the Fitbit Versa 4 provides useful SpO2 data, it may not be as accurate or comprehensive as some other smartwatches on the market. Users seeking precise continuous monitoring or medical-grade accuracy might prefer options like the Garmin Venu 3 or Withings ScanWatch.